Adjustable insulator bracket



OC- 16, 1951. A. G. STEINMAYER 2,571,495

ADJUSTABLE INSULATOR BRACKET Filed May 4, 1948 5 Sheets-Sheet l ffy E IN V ENTOR.

Oct. 16, 1951 A, G. STEINMAYER ADJUSTABLE INSULATOR BRACKET 3 Sheet's-Sheet 2 Filed May 4, 1948 fb l 2 l u u I A. G. STEIN MAYER 2,571,495

Oct. 16, 1951 ADJUSTABLE INSULATOR BRACKET Filed May 4, 1948 5 Sheets-Sheet 3 ik; f

/5 Z7 22 l 7 1 Hummm I 5 l k fio @LAT/MET@ Patented Oct. 16, 1951 ADJUSTABLE INSULATDR. BRACKET Alwin G. Steinmayer, Milwaukee, Wis., assigner to McGraw Electric Company, a corporation of Delaware Application May 4, 1948, Serial No. 24,952

4 Claims. l

This invention relates to bracket; constructions for line wires.

In Stringing line wires, for instance in power distribution systems, it is the usual practice to extend the Wire past a number of supporting poles and attach a toggle device to the wire and stretch it and thereafter distribute the sag in the wire between successive poles. Subsequently, the wire is attached to suitable insulators. Various attempts have been made to provide brackets with insulators which act somewhat in the nature of spools or pulleys for temporarily supporting the wire while it is being stretched and while the sag is being distributed between successive poles but these attempts have not proven wholly satisfactory as the constructions were relatively weak and could not stand the strains incident to this type of work without considerable danger of distorting or damaging the bracket constructions and also as the prior constructions were frequently relatively expensive to manufacture and were not, therefore, so freely used.

This invention is designed to overcome the above noted defects and objects of this invention are to provide bracket constructions for line wires which are so made that the porcelain or other insulator is formed in the manner of a spool and initially supports the wire while it is being strung, and allows the distribution of the sag of the wire between successive poles and subsequently acts as the insulator to which the wire or line is permanently attached, the construction providing an unusual amount of strength to resist distortion on the one hand and being of an extremely simple type of construction on the other, so that it may be very cheaply manufactured and may be as freely used as the customary insulators and which is somade that it does not have the disadvantages hereinabove enumerated.

Further objects are to provide a construction in which the spool-like insulator may be positioned either temporarily or permanently in any one of a multitude of positions to support the wire in any desired manner, either initially or permanently as is found most expedient.

Further objects are to provide a construction in which the supporting shaft or pin for the roller-like insulator is at all times supported at both ends, so as to reduce the effective lever arm and thus minimize the stresses imposed on the pin and bracket.

More specifically, objects of this invention are to provide a two-part bracket construction in which one of the parts is stationary and is arranged to be attached to a pole or other support. and in which the other part is movable with relation to the stationary part and is provided with the insulator and is arranged to 4be adjusted with reference to the stationary part in any desired position.

Embodiments of the invention are shown in the accompanying drawings, in which:

Figure l is a side view of one form of bracket.

Figure 2 is a sectional view on the line 22 of Figure 1.

Figure 3 is a sectional view on the line 3-3 of Figure 1.

Figure 4 is a view partly in section showing the bracket in a different position from that shown in Figure 1.

Figure 5 is a view showing the bracket in a still further position.

Figure 6 is a view corresponding to Figure 1 showing a further form of bracket.

Figure 7 is a view partly broken away and partly in section showing the bracket of Figure 6 in a different position.

Figure 8 is a view of the stationary portion of the bracket.

Figure 9 is a view of the locking member.

Figure 10 is a View of the bracket shown in Figure 6 with the bracket in a different position from that shown in either Figure 6 or Figure 7.

Figure l1 is a plan View of the structure shown in Figure 6.

Figure 12 is a front view of the structure shown in Figure 6 showing a conductor attached to the insulator of the bracket.

Figure 13 is a sectional View showing in dotted lines the manner in which the movable portion of the bracket is shifted with respect to the stationary portion of the bracket.

Referring to the form of the invention shown in Figures 1 through 5 it will be seen that the bracket construction comprises a movable, approximately circular member l formed of metal and having outwardly projecting spaced ends 2 through which a spindle or pin 3 projects. The pin is provided with a head 4 at one end and is arranged to receive a split-pin 5 at the other end. The pin 3 revolubly supports a. spool-like insulator 6 of porcelain or other suitable material.

The relatively stationary portion of the bracket structure comprises a body portion 'l which is roughly channel-shaped and provided with outwardly projecting flan-ges 8. The anges 8 are notched as indicated at 9 in Figure 3 and are arranged to receive the circular member i of the movable portion of the bracket. The body portion 1 of the stationary member is also provided with a forwardly projecting tongue or lip Il) which overhangs the adjacent portion of the circular member I and which may be provided with an upturned outer end I I if so desired. The body portion I and the tongue I are apertured and receive the attaching bolt or lag screw I2 whereby it is attachedy to the pole I3 or to any other suitable support'as shown in Figures 4 and 5. It is ap- 'parent that when the bolt I2 is tightened, that it locks the circular member I of the movable portion of thebracket in adjusted or selected position as it causes the arm Il) to clamp against the inner side of the circular member I and force the outer side of the circular member I into binding relation with the notched flanges 8 of the body portion 'I, and thus serves to securely lock the movable portion of the bracket in position.

In using the device the circular portion I may be turned in any desired position to bring the spool-like insulator either at the top or at the bottom or in'any other position. For example, during the Stringing of the line wires the spoollike insulator t may be positioned in its lowermost position as shown in Figure 4. The line wire I4 is then threaded through the circular member I and rests upon the insulator 6. As the line wire is drawn along to the neXt pole, the insulator 6 rotates in the manner of a spool or pulley and allows the line wire to freely travel through the bracket without damage to the insulation of the line wire and Without any material friction. After the line wire has been strung through the desired number of brackets, it is tightened in the usual manner and thereafter the sag of the line wire is adjusted between successive poles. This is readily accomplished as the spool-like insulators 6 freely rotate to accommodate the motion of the line wire. The line Wire is ultimately tied or otherwise secured to the insulator 6 and may be left in the position shown. in Figure 4 or may be .turned to the position shown in Figure 5 or may be positioned as shown in Figure 1 or any other desired position. Whenever it is desired to adjust the movable portion of the bracket the attaching bolt or clamping bolt I2 is loosened and the circular portion I of the bracket is rotated to the desired position.

. If it is not desired to thread the line Wire through the bracket I it is obvious that the spoollike insulator 6 is positioned in its uppermost position, as shown for instance in the second form of the invention in Figure 10. Under these conditions the line wire does not have to be threaded through the movable portion oi the bracket.

In the form of the invention shown in Figures 6 through 13 the stationary portion of the bracket is indicated by the reference character I5. It is adapted to be attached to a pole or other support I6 by means of a bolt or lag screw I'I. The stationary member or portion I5 cf the bracket is U- shaped and is provided with upper and lower arms I8 which are apertured as indicated at I9 in Figure 8.

The movable portion of the bracket is indicated by the reference character 20 and is approximately rectangular and is passed through the apertures I9. It is provided with a pair of terminal lips 2I which are apertured and receive the pinor spindle 22. The pin is headed as indicated at 23 and is arranged to receive a split pin 24. The pin 22 revolubly supports the spool-like insulator 25.v

The rectangular movable portion 20 of the bracket is adapted to be locked in any one of its 4 several positions as shown in Figures 6, '7, and 10 by means of a locking member 26. This locking member may be of any suitable type. For instance, it may be channel-shaped as indicated and may be provided with a pair of upper ears 21 to limit its downward motion.

It is apparent from an inspection of Figure 13 that there is suficient clearance when the locking member 26 is removed to allow the movable portion of the bracket to be shifted to any one of its desired positions.

In using the bracket shown in Figures 6 through 13, it is apparent that the device may be used in approximately the same manner as that shown in the rst form of the invention. For example, as shown in Figure 7 the line Wire 28 may be threaded through the movable portion of the bracket ZIJ and may rest temporarily upon the spool-like insulator 25. The Stringing of the line wires continues as previously described through successive brackets and finally the line wire is secured to the insulator 25 in any suitable manner. The insulator may be left at the position shown in Figure 7 or may be turned into a vertical position as shown in Figure 12, for instance.

If it is not desired to thread the line wire through the successive brackets, the movable portion 20 of the bracket may be turned to the position shown in Figure 10 and either temporarily or permanently locked in such position. The line wire 28, under these conditions, does not have to be threaded through the movable portion 2Q of the bracket but need merely be placed upon the spool-like insulator 25 as such insulator is now positioned at the upper portion of the bracket structure. Obviously when the line wire is finally tied to the insulator the insulator may be positioned in any one of its several positions as desired.

It will be seen that in each form of the invention a movable portion and a relatively stationary portion are provided and constitute the main body of the bracket and that the relatively stationary or supporting portion is provided with openings through which the movable or adjustable portion is threaded. It will also be seen that in each form of the invention a spool-like insulator is revolubly carried by means of a pin and is arranged to furnish a temporary revoluble support for the line wire while it is being strung, stretched, or properly sagged between the successive poles.

It will be seen further that there are no undue strains imposed on any portion of the bracket and that the supporting pin for the insulator is supported at all times at both ends.

It will be seen further that the construction is very simple to produce and is easy to use.

Although this invention has been described in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

I claim:

1. A bracket construction for line wires comprising a supporting member arranged to be attached to a support, an adjustable member in the form of an approximately closed gure carried by said supporting member and slidable therethrough, a spool-like insulator revolubly carried by said adjustable member, said adjustable member being movable lengthwise thereof withrespect to said support, and means forlocking said adjustable member to said support with the axis of said spool-like insulator selectively arranged at different angular and bodily shifted positions.

2. A bracket construction for line wires com prising a supporting member arranged to be attached to a support, said supporting member being provided with openings, an adjustable member in the form of an approximately closed figure threaded through the openings of said supporting' member and being slidabie through said openings to different positions, insulator carried by said adjustable member, and means for locking said adjustable member to said supporting member to hold the axis or" the insulator at different selected angles.

3. A bracket construction for line wires comprising a U-shaped supporting member having outwardly projecting apertured arms and being arranged for attachment to a support, an adjustable member in the form of an approximately closed iigure threaded through the apertured arms, means for locking said adjustable member in any one of several positions with reference to said apertured arms, a pin carried by said adjustable member and supported at opposite ends by said adjustable member, and a spool-like insulator revolubly carried by said pin.

4. A bracket construction for line wires comprising a supporting member arranged to be attached to a support, an approximately circular adjustable member adjustably carried by said supporting member, means for locking said adjustable member to said supporting member in any desired adjusted position, said adjustable i member having spaced arms, a pin carried by said spaced arms and a spool-like insulator revolubly carried by said pin.

ALWIN G. STEINMAYER.

CITED The following references are of record in the ile of this patent:

UNITED STATES PATENTS Number Name Date 1,702,235 Steinberger Feb. 12, 1929 1,766,252@ Kearney June 24, 1930 2,300,674 Johns et al. Nov. 3, 1942 

